Final answer:
Complete independence in toilet transfers entails the ability to perform the transfer without assistance or the use of a device, which is best represented by the option of a standing pivot with safety precautions.
Step-by-step explanation:
Complete independence in toilet transfers involves the option that does not require assistance or the use of a device. Therefore, the correct answer is: a) Standing pivot with safety precautions. This requires the person to have the strength, balance, and mobility to pivot and move from a wheelchair to the toilet, or vice versa, on their own while taking necessary safety measures like using non-slip mats or ensuring the area is clear of hazards.
It's important to note that while other options such as sliding board use (option b), grab bars (option c), and device-assisted transfers (option d) all aid in toilet transfers, they do not represent complete independence since they involve the use of some form of assistance or equipment.